Question

Low temperature is harmful for plants, because it has

• A. Desiccation effect
• B. Chilling effect
• C. Freezing effect
• D. All of the above

Answer 1

The correct option is D All of the above

Damage from low temperatures generally develops because ice crystals form in plant cells resulting in damage to cell membranes and organelles. Dehydration or low water status can also occur as a result of low temperatures. Many plants native to tropical regions can be injured by chilling injury (e.g., damage occurs above 32${}^{0}F$; 0${}^{0}C$) and killed, if sub-freezing temperatures occur for long periods of time. Other plants may be better adapted for cold environments and not experience damage until temperatures are at or below freezing (32${}^{0}F$; 0${}^{0}C$).

For example, Bermuda grass is adapted for the southern zones of the United States but slightly farther north, Bermuda grass has an extended period of winter dormancy but also can be killed due to sustained sub-freezing winter temperatures.

Thus, the correct answer is option D.